The Republican presidential contest is shifting to a critical two-week phase ahead of the South Carolina primary, which may prove to be the last chance for Nikki Haley to blunt Donald Trump's march to the nomination. Enjoying a difficult day for President Joe Biden and fresh off another dominant win in the Nevada caucuses, Trump heads to Pennsylvania on Friday, where he'll address the National Rifle Association. From there, the former president will be in South Carolina this weekend where he and Haley will hold dueling campaign events ahead of the state's Feb. 24 primary.
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